The Effect of Metal Type on Hydrodeoxygenation of Phenol Over Silica Supported Catalysts

Teles, Camila A.; Rabelo‐Neto, Raimundo C.; Lima, Jerusa R. de; Mattos, Lisiane V.; Resasco, Daniel E.; Noronha, Fábio B.

doi:10.1007/s10562-016-1815-5

Cited by 92 publications

(81 citation statements)

References 38 publications

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“…It was found that the selectivity of phenol hydrogenation depends on the reaction pathways over different metallic catalysts. The reason is the correlation between hydrodeoxygenation activity and the affinity of metals to bond with oxygen . Noronha et al.…”

Section: Introductionmentioning

confidence: 99%

Phenol Catalytic Hydrogenation over Palladium Nanoparticles Supported on Metal‐Organic Frameworks in the Aqueous Phase

Chen

Pfefferle

et al. 2018

ChemCatChem

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Metal‐organic frameworks (MOFs) have been extensively applied as supports in hydrogenation catalysis owing to their topological structure and high hydrogen storage capabilities. Pd nanoparticles (NPs) supported on a hollow box‐shaped MOF were prepared for phenol hydrogenation in the aqueous phase. The MOF preparation modulated by monocarboxylic acids grow into different structures. MOF140‐AA, modulated by acetic acid at 140 °C, presents the structure of regular cube with a smooth surface. Compared to other supports, Pd NPs supported on MOF140‐AA presents high phenol conversion due to the high hydrogen storage capability of MOF140‐AA. Phenol is completely converted to cyclohexanol over Pd/MOF140‐AA reacted at 260 °C for 2 h with high selectivity. The reaction mechanism of phenol hydrogenation is studied by density functional theory (DFT). The phenol hydrogenation mechanism is calculated on a Pd38 cluster, which describes the reaction pathway consistent with experimental results.

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Section: Introductionmentioning

confidence: 99%

Phenol Catalytic Hydrogenation over Palladium Nanoparticles Supported on Metal‐Organic Frameworks in the Aqueous Phase

Chen

Pfefferle

et al. 2018

ChemCatChem

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“…Consequently, this brings about not only an increase in operating cost but also inevitable contamination of the bio-oil. 12,13 With respect to precious metal catalysts, such as Pd, Pt, Ru, and Rh [14][15][16][17] , despite their excellent HDO activity, their industrial application prospect is restricted due to their resource scarcity and high cost. In contrast, transition metal phosphide, [18][19][20][21][22] nitride, 23,24 carbide 25,26 and Ni 27-29 supported catalysts are relatively clean and efficient catalyst systems for the HDO process.…”

Section: Introductionmentioning

confidence: 99%

Highly selective hydrodeoxygenation of anisole, phenol and guaiacol to benzene over nickel phosphide

Juan

Chen

2017

RSC Adv.

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Ni 2 P supported catalysts have extensively been studied for various hydrodeoxygenation (HDO) reactions.However, the main products are cyclohexane or cyclohexanol for lignin-derived compounds HDO over these catalysts. In this study, we investigate the catalytic conversion of anisole, phenol and guaiacol to benzene over Ni 2 P/SiO 2 by probing the reaction conditions. The results show that a lower reaction temperature and higher H 2 pressure favour the hydrogenation of these model chemicals to cyclohexane, whereas a higher reaction temperature and lower H 2 pressure aid the generation of benzene. The cyclohexane and benzene yields are 89.8% and 96.0% at 1.5 MPa and 573 K and 0.5 MPa and 673 K, respectively. By eliminating the influence of internal and external diffusion, the low intrinsic activation energy of 58.2 kJ mol À1 is obtained, which explains the high catalytic activity. In addition, although guaiacol HDO has a low conversion due to the space steric effect of its substituents, it presents a similar reaction pathway to obtain anisole and phenol, which is dependent on reaction conditions. The long-run evaluation experiment shows that the activity and selectivity of anisole HDO to benzene changes slightly for 36 h.

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“…For these two bifunctional catalysts, the first peak (174 °C for Co/HZ‐22, 168 °C for Co/HZP‐22) is attributed to CoOOH (Co 2 O 3 ⋅H 2 O)→Co 3 O 4 , and we speculate that CoOOH species probably originated from the interaction between Co(NO 3 ) 2 ⋅6 H 2 O and the zeolitic support Al−OH during calcination . The second peak (346 °C for Co/HZ‐22, 335 °C for Co/HZP‐22) and third peak (374 °C for Co/HZ‐22, 365 °C for Co/HZP‐22) were ascribed to Co 3 O 4 →CoO and CoO→Co 0 , respectively, as in the case of the Co/SiO 2 precursor (Figure a) . Furthermore, higher reduction temperatures were observed at around 435 and 553 °C especially for the Co/HZP‐22 precursor, which were attributed to the distribution of Co 2+ species over mesopores HZP‐22 and strong metal‐support interaction, respectively …”

Section: Resultsmentioning

confidence: 82%

“…The H 2 temperature‐programmed reduction (H 2 ‐TPR) curve of the Co/SiO 2 precursor (Figure a) shows that there were clear reduction peaks from 300 to 400 °C, assigned to Co 3 O 4 →CoO→Co 0 . The H 2 ‐TPR curves of Co/HZ‐22 (Figure b) and Co/HZP‐22 (Figure c) precursors were measured to study the effect of the postsynthesis treatment of zeolite HZ‐22 on the reducibility of CoO x species.…”

Section: Resultsmentioning

confidence: 99%

Influence of Porosity on Product Distribution over Co/H‐ZSM‐22 Catalysts in the Upgrading of Palmitic Acid

Liu

Shi

et al. 2018

Energy Tech

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The catalytic conversion of palmitic acid was studied over Co/SiO2, H‐ZSM‐22 (HZ‐22), Co/H‐ZSM‐22 (Co/HZ‐22), mesoporous H‐ZSM‐22 (HZP‐22), and Co/H‐ZSM‐22 (Co/HZP‐22) catalysts. For the bifunctional catalysts, on the one hand, the porosity of zeolitic supports provided uniform accommodation for Co particles to realize the good distribution and downsizing of metal particles; on the other hand, the impregnation of Co into zeolitic supports improved the acidity of bifunctional catalysts that presented more weak/strong acid sites and stronger acid strength. Compared to sole metal centers over Co/SiO2 (no isomerization), the hydrodeoxygenation and hydroisomerization of palmitic acid were achieved simultaneously over bifunctional Co/HZ‐22 and Co/HZP‐22 catalysts (4 wt % Co loading) in one step. Mesoporous Co/HZP‐22 possessed an excellent catalytic performance during the upgrading of palmitic acid to yield the highest amount of iso‐alkanes. Importantly, the metal/zeolite bifunctional catalysts tailored the deoxygenation route significantly from hydrodecarbonylation (major) over sole metal catalysts or zeolites (only metal centers and only acid sites) to the hydrodeoxygenation route (major) over Co/zeolite bifunctional catalysts (both metal centers and acid sites).

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The Effect of Metal Type on Hydrodeoxygenation of Phenol Over Silica Supported Catalysts

Cited by 92 publications

References 38 publications

Phenol Catalytic Hydrogenation over Palladium Nanoparticles Supported on Metal‐Organic Frameworks in the Aqueous Phase

Phenol Catalytic Hydrogenation over Palladium Nanoparticles Supported on Metal‐Organic Frameworks in the Aqueous Phase

Highly selective hydrodeoxygenation of anisole, phenol and guaiacol to benzene over nickel phosphide

Influence of Porosity on Product Distribution over Co/H‐ZSM‐22 Catalysts in the Upgrading of Palmitic Acid

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